- Michelson Energy Co
- Michelson Energy Co
- Mid-Continent Energy Corp
- Mid-States Operating Co
- Midland Energy Inc
- Millennium Brokerage Svc
- Millwee Oil Inc
- Mina Energy Inc
- Mina Energy Inc
- Minihan Oil & Gas Corp
- Miocene Oil & Gas Inc
- Miramar Petroleum Inc
- Molz Oil Co
- Momentum Energy LLC
- Moncrief Oil
- Moncrief Oil
- Monroe Seal Fast Warehouse
- Moody Energy
- Moon Operating Inc
- Moore Oil Co Inc
- MPG Petroleum
- MPG Petroleum
- Mull Drilling Co
- Musselman Interests LTD
- Musselman Interests LTD
- Naumann Oil & Gas
- Nivla Oil Corp
- Noble & Cantrell Exp Co Inc
- Non-Pub Sonora Petruleum
- Non-Pub Sonora Petruleum
- Nor-Tex Gas Corp
- North American Reserve Corp
- Northstar Operating Co
- O G Mc Dowell
- O R Whiteside Inc
- Odessa Oil Investments
- Oil & Gas Exploration
- Oklahoma Oil Tactics
- Olsen Energy Inc
- Olsen Energy Inc
- Olsen Oils Inc
- Olsen Oils Inc
- Omni Oil & Gas Inc
- One Epoch Energy
- One Epoch Energy
- Operating Co
- Oso Exploration Co
- Oso Exploration Co
- Ouachita Exploration Warehouse
- Overly Operating Co
- Overly Operating Co
- Owen C Finch
- Owen C Finch
- P & M Petroleum Management
- Paleo Inc
- Palisades Operating Co
- Palomino Petroleum Inc
- Pan-Ok Production Co
- Patriot Petroleum Co
- Paul H Byrne Jr
- Paul L Davis Jr
- Paul L Davis Jr
- Pawnee Oil & Gas
- Peak Energy Corp
- Peak Energy Corp
- Pecos Production Co
- Pennant Petroleum Inc
- Pennington Oil Co
- Penwell Energy Inc
- Petro Atlas Corp
- Petro Operating Co
- Petro-Beth Oil & Gas Inc
- Petro-Beth Oil & Gas Inc
- Petrodata Resources
- Petroleum Professionals Intl
- Petroleum Service Partners Inc
- Petroleum Unlimited Inc
- Phillip M Pitzer
- Phillips Energy Inc
- Phillips Oil
- Phoenix Operating Co
- Phoenix Operating Co
- Phoenix Operating Inc
- Pico Drilling Co LTD
- Pico Drilling Leeray Ranch
- Pierce Operations
- Piney Woods Emu Products
- Pinnacle Operating Co
- Pioneer National Resources USA
- Plains All American
- Plains All American Pipeline
- PMI Energy Co
- PNG Operating Co
- Pontotoc Gathering LLC
- Pontotoc Production Inc
- Price Energy
- Primal Energy Corp
- Primavera Resources
- Primavera Resources
- Primrose Operating Co
- Prize Energy
- Prize Operating Co
- Production Operations & Mgmt
- Production Resources Inc
- PSI Production Inc
- Pure Resources
- Quail Operating Inc
- Quail Operating Inc
- R B Cowden Family Prop LTD
- R Doyle Mc Mahan
- R Doyle Mc Mahan
- R J Graham Oil Co
- R J Lewis Oil Co
- R L Rominger
- R M Kolb & Assoc
- R M Kolb & Assoc
- R S Peveto
- R W Operating Corp
- RAF Oil Co
- Randy Cape
- Randy Cape
- Randy Cape Oil & Gas
- Range Oil Co
- Raven Properties
- Ray Richey & Co
- Raymond Hedge & Assoc
- RDR Energy LLC
- Read & Stevens Inc
- Red Rock Resources LLC
- Redstone Operating Inc
- Redstone Operating Inc
- Refined Vegetable Oils
- REH Energy Inc
- Remuda Operating Co
- Rendova Oil Co
- Rendova Oil Co
- Reserve Operating Corp
- Revel Oil & Gas Inc
- Rhombus Operating Co LTD
- Richard E Clark Inc
- Richard W Simpson III
- Richey Properties Inc
- Richland Energy Inc
- Richter Operating Co
- Rincon Petroleum Corp
- Rippy Oil Co
- RKG Operations Inc
- Robbins Petroleum Corp
- Robert B Coleman
- Robert Beamon
- Robert Beamon
- Robert H Hannifin Office
- Robert J La Fortune
- Robert O Canon
- Robert O Canon
- Robert R Click
- Roberts & Hammack Inc
- Roberts Trust
- Robertson Resources Inc
- Robinson Operating Co
- Robinson Operating Co
- Rock Island
- Rockwood Resources Inc
- Rockwood Resources Inc
- Rodney Popejoy
- Roger's Interest
- Rowland & Assoc
- Roy E Kimseyjr
- Rust Oil Corp
- Ryder Scott Oil Co
- Ryder Scott Oil Co
- Rymes Heating Oils Inc
- S B Street & Co
- S B Street & Co
- S W Blount III
- S W Blount III
- Sabre Exploration Inc
- Sabre Exploration Inc
- Sage Oil Co
- Sam F Hurt Jr
- Sammy Crutcher
- Sammy Crutcher
- Sammy Crutcher
- Sammy Crutcher
- Sandel Energy
- Sanvin Inc
- Sauder Management
- Sauder Management
- Saxet Oil Corp
- Schkade Bros Operating Co
- Schkade Bros Operating Co
- Schlachter Oil
- Scott AV Investments LTD
- Scott AV Investments LTD
- Scott Oils Inc
- Scott Oils Inc
- Scythian Limited
- Seaboard Oil Co
- Seagull Operating Co Inc
- Seeker Oil Co
- Seeker Oil Co
- Sha-Jam Operating Corp
- Shinnery Oil Co
- SHS Operating Co
- Shulman Brothers
- Shulman Brothers
- Shulman Brothers
- Sigmon Production
- Signal LLC
- Singer Oil Co
- SMC Oil & Gas Inc
- Smith Oil Properties Inc
- SND Operating
- Sojourner Drilling Corp
- Sojourner Drilling Corp
- Somex Energy Co
- Somex Energy Co
- Sonora Petroleum Corp
- Sonora Petroleum Corp
- South Oak Production Co
- South Texas Operating Co
- South Texas Operating Co
- Southern Royalty Inc
- Southwest Land Co
- Southwest Oil & Land Inc
- Southwest Operating Inc
- Special Energy Corp
- St John John
- St John John
- Standard Operating Co
- Starco Exploration Inc
- Startex Operating Co
- Stephens & Johnson Operating
- Stephens & Johnson Operating
- Stevens & Tull
- Stout Energy
- Stovall Operating Co
- Stovall Operating Co
- Strategic Energy Investments
- Street Investment Co
- Street Investment Co
- Sullivan & Co Vassar
- Sun-Key Oil Co
- Sunday Corp
- Synergex Inc
- T M Hopkins Inc
- T-N-T Engineering Inc
- T-N-T Engineering Inc
- Tasajillo Energy
- Tasajillo Energy
- Taubert Energy
- Taubert Energy
- TCT Operating Co
- TCT Operating Co
- Technical Energy Svc
- Terminal Ventures
- Terrace Petroleum Corp
- Texas American Resources Co
- Texas Crude Operator Inc
- Texas Energy Sources Inc
- Texas Engery
- Texas Gas Transmission
- Texas Gas Transmission
- Texas Gas Transmission LLC
- Texas Petroleum Investment Co
- Texas United Geo Production
- Texas United Geo Production
- Texlan Oil Co
- TGB Inc
- TGT Petroleum Corp
- Thomas B Hemingway
- Thomas B Hemingway
- Three P Operating Co
- Threeway Drilling Co
- Tidal Petroleum
- Tidal Petroleum
- Tidemark Petroleum
- Tidemark Petroleum
- Tierra Exploration Inc
- Tim Fitzgerald
- Tim Fitzgerald
- Tim Fitzgerald
- Tim Fitzgerald
- Tipco Operating Co
- TKL Oil Properties Inc
- TKP Petroleum
- TKP Petroleum
- Todd Oil & Investment Inc
- Tom E Johnson
- Tom E Johnson
- Tom Kight Investments
- Tommy Young Oil Co
- Trans Pacific Oil
- Trapp Co
- Trenna Oil Inc
- Trepco Production Co
- Trey Resources Inc
- Trinity Production Co
- Triton EP
- Triton EP